Holder for thermionic valves



0 nwE/vreR "/IZA CQLM C00 1 I I 1 1 I M. COOPER HOLDER FOR THERMIONIC VALVES Filed Aug. 26 1924 5 3, I I 1 I ll May 19 ZPatente May 19, 1925..

UNITED STATES ATE: QFFICE.

IIIALCOLM COOPER, OF BALI-1AM, ENGLAND, AS SIGNOR TO THE H. T. C. ELECTRICAL CO: LIMITED, 01' LONDON, ENG-LAND, A BRITISH COIVHPANY.

HOLDER FOR THERMIDNIC VALVES.

Application filed August 26, 1924.. Serial No. 734,292.

To aZZ whom it may concern:

Be it knqwn that I, MALCOLM Coorrn, a subject of the King of Great Britain and Ireland, and a resident of Balham, county of London, England, have invented a cer tain new and useful Improvement in Holders fo1" 'llier1nionic Valves, of which the following is a'specification.

This invention relates to thermionic valves having caps with four or more pins or legs so arranged or. positioned on the cap as to ensure that they can only be made to engage with their appropriate sockets or contacts in the holder.

The present invention provides a holder in which the minimum distance between the various conta-cts'is that of the valve legs or prongs themselves and in which allowance is made for any irregularities inposition of said valve legs and contact is made by means of iL-shap-ed or U-shaped springs longitudinally aligned with and inwardly inclined towards the valve legs, the outer sides of which make longitudinal sliding contact with increasing pressure against the curved inner sides of the spring when w the valve is put into posi ion, the said springs being secured to a ring or other suitably shaped piece of good insulating material, adaptedto be secured to any existing panel or board, or being'bolted to the underface of a mould of insulating material adapted to be secured to a board of poor insulating material, so that in either case the said springs coincide with the positions of the valve legs when said valve is in position. By this means the valve holder has high insulation resistance, due to the wide spacing of the contact springs, and low self-capacity owing to the small amount of metal in the springs.

The invention is illustrated by the accompanying drawings, wherein Figure 1 is a plan view of a holder for attachment to a panel.

Figure 2 is a sectional view thereof.

Figure 3 is a plan view of the template used when drilling the holes in the holder.

Figure 4 is a plan View of a holder for attachment to a board of poor insulating material.

Figure 5'is a sectional view thereof.

Figure 6 is a view of a modified form of device.

Like numerals of reference indicate corresponding parts in the several figures. Referring to the drawings, the holder consists of a ring 1, or mould-shaped piece 1 of goodinsulating material of any suit able thickness, say inch, the internal diameter of the ring 1 or mold 1 being slightly greater than the space occupied by the valve legs.

L.-shaped springs 2 are provided each with one arm extending outwards and holed for external connection and bolted or riveted to one face 01 the ring 1 or mould 1 aforesaid at suitable points to coincide with the positions of the valve legs, whilst the other arms of said springs project into and through the ringer -from the mould towards the board and are curved or bent from. the same centre as the valve legs in such manner that each spring will engage and make contact with one of the prongs or legs of the valve when the same is in position, external connection being made either from the bolts 3 holding said L-shaped springs 2, or from the arms by which the springs are fixed, the arms extending outwards and used as soldering tags, or, if necessary, both arrangements may be employed.

U-shaped springs 2 may be used with their inner arms curved or bent to ensure good contact with the valve legs and with the outer arms holed like those of the L- shaped springs 2 for use as externally connectingor soldering tags. The end parts of springs 2 and the middle parts of springs 2 have countersunk holes to receive countersunk headed bolts so that the insulating ring 1 can be easily fitted to the panel without recessing the latter to admit the bolt heads. The insulating ring 1 is also fitted with metal inserts or bushes 3 to accommodate the bolts, the outer ends of which inserts are also countersunk to suit the countersinking of the springs and bolt heads. In the mould 1 the bolts are fitted with flat sided nuts 4 or with cylindrical screwedcollars of such thickness or depth as will slightly exceed the depth of the supporting and spacing rim or legs of the mould 1 and will take the strain therefrom when the mould is secured to a panel or board.

In practice, the fiber or other insulating ring 1 or mould 1 as the case may be, is secured by two or more screws 4 to any existing panel or board 5, so that the springs 2 or 2 project downwards, as in Figures 1 and 5, and coincide with holes (3 drilled in the panel or board 5, Figure 2, or mould 1 Figure 5, for the reception of the valve legs, the diameter of said holes 6 being larger than'is otherwise necessary to accommodate any irregularity in the position of the valve legs as sometimes occurs, said holes 6, if

desired, also being countersunk to accommodate the usual practice of soldering connections to the top of the valve legs.

The valve beingv inserted, the bottom of the valve ca panel 5, or t e mould 1 as the case may be, and the pins or legs 8 project through it and make contact with their respective springs 2 or 2 and in this manner is the valve firmly held in position.

When using the ring form of holder, there will also be furnished a template 9 provided with the holes whereby correct drilling position of the holes necessary for panel mounting can be obtained.

It is obvious that the maximum insulation is obtained owing to the, fact that the minimum distance between two contacts is that of the valve le S themselves. Further, it is also impossib e to make contact between the wrong electrodes and damage the valves, owing to the fact that contact is not made until after right position has been determined by the standard arrangement of valve legs or pins.

If desired, the bolts 3 may, as shown in Figure 6, be lengthened so as to extend throughthe panel 5 and be locked thereto by nuts 10.

I claim 1. A holder for thermionic valves with a plurality of pins or legs and suitable for fixing toa panel, comprising a ring of insulatmg material, contact 5 rings each with one arm extending outwar s, holed for external connection and secured to the said ring at a suitable interval from the adjacent springs so as to coincide with the positions 7 lies flush with the top of the of the valve legs and holes in the panel, and with the other arm pro'ecting into and through the rim and longitudinally aligned with and inwardly inclined towards the corresponding valve leg and curved from the same centre, a bolt through the outwardly extending arm of each contact spring fitted with nuts, a metal insert to accommodate each bolt and screws for fixing the ring to the panel.

2. A holder for thermionic valves with a plurality of pins or legs and suitable for xing to a panel, comprising a ring of insulating material, U-shaped contact s rings each with one arm extended outsi e the ring and holed for external connection, with the middle part secured to the ring at a suitable interval from the adjacent springs so as to coincide witlrthe positions of the valve legs and holes in the panel, and with -'the inner arm rojecting into and through the ring and ongitudinally aligned with and inwardl inclined towards the corresponding valve leg and curved from the same centre, a countersunk headed bolt through the middle part of each contact spring fitted with nuts, a metal insert with countersunk end to accommodate each bolt and screws for fixing the ring to the panel.

3. A holder for thermionic valves with a plurality of pins including in combination with a panel board having pin receiving openings, a ring of insulating material having openings, a plurality of contact sprin s of angular formation and provided wit openings for registering with the openings in the insulating ring and an arm portion of said springs extending longitudinally with respect to the axis of the valve pins and inclined across the path of such pins, headed fastenings for passing through the registering openings of the contact 3 rings and the ring of insulating materia, and other fastenings for connecting the ring of insulating material to the panel board.

In testimony whereof I have afiixed my signature hereto this 12th day of August 1924.

MALCOLM COOPER. 

